While America's political kingmakers inject their millions into high-profile presidential and congressional contests, Democratic mega-donor George Soros has directed his wealth into an under-the-radar 2016 campaign to advance one of the progressive movement's core goals — reshaping the American justice system.

The billionaire financier has channeled more than $3 million into seven local district-attorney campaigns in six states over the past year — a sum that exceeds the total spent on the 2016 presidential campaign by all but a handful of rival super-donors.

His money has supported African-American and Hispanic candidates for these powerful local roles, all of whom ran on platforms sharing major goals of Soros', like reducing racial disparities in sentencing and directing some drug offenders to diversion programs instead of to trial.